Sun Conure Health question

by Raymond
(Usa)

My sun conure is sneezing a little too often and a little water comes out from his nose. Today, he was really mad and he bit the cage bars really hard. The paint came off a little bit. His feathers are fluffed and he is sitting on the little bed I made for him from a snuggie blanket. Its not on the bottom of his cage. His eyes are kind of closing and he keeps bobbing his head up and down slowly. Please help!! Thanks.